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MC13224VR2 数据表(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC13224VR2 数据表(HTML) 10 Page - Freescale Semiconductor, Inc |
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10 / 48 page  MC13224V Product Preview, Rev. 1.0 10 Freescale Semiconductor 2.6.2.2 CRM Operation The CRM has primary control of the entire system: • Reset and power up — After release of the hardware RESETB signal, the CRM will perform a power up sequence of the MCU. The linear regulators and clock sources are managed for a graceful start-up of the MCU and its resources. The radio is not powered until needed • Normal operation of MCU — The clock management of the MCU and its resources are controlled by the CRM. The processor clock is programmable from low frequencies up to the maximum reference frequency (13-26 MHz optional w/24 MHz standard) to allow the application to trade-off processing speed versus power savings • Sleep modes and recovery — There are two sleep modes of Hibernate and Doze. The primary difference is that Doze mode keeps the reference oscillator running. Both modes can retain critical programmed parameters and have selectable sizes of RAM retention. Hibernate has lowest power, but Doze allows high accuracy sleep timing. The CRM manages the recovery from low power, similar to power-up from reset, providing regulator and clock management. — Wake-up can be based on external interrupts through 4 KBI inputs — Wake-up can be from internal interrupts — Wake-up can be based on an RTI (wake-up) timer. • The RTI timer has two possible frequency sources that provide a very low power wake-up option from sleep — One option is an onboard, low accuracy 2 kHz oscillator — A second option is to add an external 32.768 kHz crystal for the RTI clock source — A 32-bit timer allows greater than a 36.4 hour wake-up delay with the 32.768 crystal oscillator • Other features of the CRM: — An optional COP watchdog timer to monitor CPU program activity — A programmable software reset 2.6.3 Optional Buck Regulator For battery based applications, an optional buck regulator is provided to maximize battery life. Figure 4 shows the configuration of the buck regulator versus the normal connection. An onboard MOSFET is used as a switch with an external 100 μH inductor and 10μF capacitor when the buck regulator is enabled. The buck regulator drops the higher battery voltage to 1.8 - 2.0 Vdc that is applied to the onboard linear regulators. This allows lower net current from the battery to maximize the life of the battery. |
类似零件编号 - MC13224VR2 |
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类似说明 - MC13224VR2 |
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